2017/12/28 by T. M. Whitehead, Thomas M. Whitehead, G. J. Conduit
Materials Science · Physics and Astronomy · #Cold Atom Physics and Bose-Einstein Condensates #Condensed matter physics #Cooper pair #Electron #Fermi Gamma-ray Space Telescope #Fermi gas #Fermion #Instability #Magnetic and transport properties of perovskites and related materials #Momentum (technical analysis) #Pairing #Physics #Physics of Superconductivity and Magnetism #Quantum electrodynamics #Quantum mechanics #Spin (aerodynamics) #Superconductivity #cond-mat.quant-gas #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.97.014502
11 pages, 6 figures, accepted for publication in Physical Review B
arxiv created 2017/12/28 · openalex publication_date 2018/01/04 · arxiv updated 2018/02/14 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Weak attractive interactions in a spin-imbalanced Fermi gas induce a multiparticle instability, binding multiple fermions together. The maximum binding energy per particle is achieved when the ratio of the number of up- and down-spin particles in the instability is equal to the ratio of the up- and down-spin densities of states in momentum at the Fermi surfaces, to utilize the variational freedom of all available momentum states. We derive this result using an analytical approach, and verify it using exact diagonalization. The multiparticle instability extends the Cooper pairing instability of balanced Fermi gases to the imbalanced case, and could form the basis of a many-body state, analogously to the construction of the Bardeen-Cooper-Schrieffer theory of superconductivity out of Cooper pairs.